Windows – Batch scripting: iterate over drive letters

This will get most of it:

Net Use

If you have any drives mapped via subst you would also need to get those:

Subst

For completeness, you would do it like this in Powershell (if you are on windows 7 or have installed it):

gwmi win32_LogicalDisk -filter DriveType=4

You can also do it from the command prompt or a batch file using WMI like this:

wmic logicaldisk get caption,providername,drivetype,volumename

It is not possible. The limit is refered to in this Microsoft support page:

http://support.microsoft.com/kb/307889

Because mounted drives are not subject to the 26-drive-letter limit for local drives and mapped network connections, use mounted drives when you want to gain access to more than 26 drives on your computer.